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I have a question about SSL (self signed certificate) in connection with a subdomain.

The following scenario:

there exists a Motobix camera, which is reachable via a fixed IP. (Example: 192.120.203.32) The goal is to achieve the display of the image in the browser via https.

Procedure:

On a separate web server, I have made DNS settings for a domain. I created an A-record for a subdomain that points to the IP of the camera. (Example: video.domain.com) For the camera itself, I created a self-signed certificate via the admin interface, whose "Common Name" contains the subdomain (video.domain.com), through which the camera should be accessed in the browser.

Unfortunately, however, the certificate is marked as invalid. Have I forgotten something important here or have I fundamentally misunderstood something?

Thank you very much for your competent answers.

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  • Did you set the SAN as well? That's usually the reason
    – user163495
    Dec 13, 2021 at 10:20
  • Have you added the CA to the browser?
    – vidarlo
    Dec 13, 2021 at 10:21
  • @MechMK1 No, on the Admin Interface I have no option to add a SAN. Is there a way to add it afterwards?
    – Vueer
    Dec 13, 2021 at 10:25
  • No, certificates can't be edited afterwards. You have to create your own certificate, then set it on the server
    – user163495
    Dec 13, 2021 at 10:58
  • @MechMK1: I've created a new certificate on the server with SAN included with openSSL and installed it on the camera. But the browser still not trust this website.. :/
    – Vueer
    Dec 13, 2021 at 14:10

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